If you were, you know, living your lives, you've probably missed it, but old fires are burning brightly once again: there's somewhat of a falling-out going on between KDE and GNOME, with Canonical siding squarely with... KDE. The issue seems to revolve around GNOME's lack of collaboration, as explained by KDE's Aaron Seigo.

The linux desktop has long suffered with the GNOME vs KDE split, and here comes Mr Shuttleworth trying to create a 3rd desktop to divide the community even further. And what's funny is he calls it UNITY!!!
Who cares about your freakin indicators....
Hey mamma look! We changed the maximize / minimize buttons to the left!!
How about trying to participate in GNOME from the inside, in a democratic way, like everyone else! But hey, you've already said that UBUNTU is not a democracy!
Guess what? GNOME is not your bitch... Get over it!